@phaserjs/phaser/display/SendChildToBack.js

Phaser 4

import { GetFirstChildID } from "../components/hierarchy/GetFirstChildID";
import { GetNumChildren } from "../components/hierarchy/GetNumChildren";
import { GetParentID } from "../components/hierarchy/GetParentID";
import { InsertChildIDBefore } from "../components/hierarchy/InsertChildIDBefore";
import { SetDirtyParents } from "../components/dirty/SetDirtyParents";
export function SendChildToBack(child) {
  const childID = child.id;
  const parentID = GetParentID(childID);
  const numChildren = GetNumChildren(parentID);
  const first = GetFirstChildID(parentID);
  if (parentID && numChildren > 0 && childID !== first) {
    InsertChildIDBefore(first, childID);
    SetDirtyParents(childID);
  }
  return child;
}